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Using shunts to spot PV module degradation

July 25, 2023
in News
Using shunts to spot PV module degradation
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Scientists in Ireland investigated the effect of shunt resistance on a PV cell’s electrical performance. The group says its finding could potentially lead to the development of models for early detection of various forms of cell degradation, allowing for intervention to repair or replace components before major power losses occur.

July 25, 2023 Mark Hutchins

Scientists wired resistors into a PV cell to vary the shunt resistance, gaining valuable insight into PV module degradation.

Image: Wikimedia Commons

Solar cells and modules are designed to be highly resistant to ‘shunts’ – which create an alternate pathway for a solar-generated charge, leading to power losses. Reduced shunt resistance is associated with multiple forms of module degradation and failure, including hotspots and potential-induced degradation.

A group of scientists led by Ireland’s University College Cork looked to further investigate the relationship between shunt resistance and other electrical characteristics of a solar cell, such as maximum power, fill-factor, open circuit voltage and short circuit current – with the aim of developing a model that can spot cell degradation before it has advanced to the point of causing major performance loss or safety issues.

The group worked with multicrystalline silicon solar cells, designing a system that allowed them to place a resistor between the p and n junction of the cell, and thus control its shunt resistance. The experimental setup is described in full in the paper “Experimentally derived models to detect onset of shunt resistance degradation in photovoltaic modules,” published in Energy Reports.

After testing five cells under various combinations of shunt resistance, illumination and other factors, the group found that maximum power, open circuit voltage, and fill factor were all directly affected by changes to the shunt resistance, while short circuit current was not affected. The work shows that once shunt resistance decreased to around 100 ohms per square centimeter, corrective action needs to be taken.

Using the figures from its experiments the group developed models to detect decreasing shunt resistance. “These models can be easily applied to detect the onset of critical PV degradation or failure caused by shunt resistance degradation and are suitable for implementation in online condition monitoring systems,” the group said.

The group also suggests that future work could move towards classifying module degradation based on the calculated shunt resistance loss.

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